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Finding the Fourth Proportional to 28,219.40, 38,940.02 and 15,643.88

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Solution

The fourth proportional to 28,219.40, 38,940.02 and 15,643.88 is: 21,587.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,219.40 : 38,940.02 = 15,643.88 : x
  2. Step 2: Convert to fraction form
    28,219.40/38,940.02 = 15,643.88/x
  3. Step 3: Cross multiply
    28,219.40x = 38,940.02 × 15,643.88
  4. Step 4: Simplify right side
    28,219.40x = 609,173,000.08
  5. Step 5: Solve for x
    x = 609,173,000.08/28,219.40
  6. Step 6: Final answer
    x = 21,587.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.